Sodium hydride → HCID 19434958, compound

Participants

Reaction Steps

515 mg (1.32 mmol) of 5-amino-6,8-difluoro-2-(3-fluoro-4-pivaloylaminophenyl)-4H-1l-benzopyran-4-one obtained in Example 66 was dissolved in 15 ml of dimethylformamide under argon atmosphere, 160 mg of sodium hydride (60% oil dispersion) and 0.38 ml of 1-bromo-4-methylpentane were added under ice-cooling and the mixture was stirred at room temperature for 2 hours. An aqueous saturated solution of ammonium chloride was added to the reaction solution and the mixture was extracted twice with ethyl acetate. The organic layer was washed with an aqueous saturated solution of sodium chloride and dried over anhydrous sodium sulfate and the solvent was distilled off under reduced pressure. The residue was purified by silica gel chromatography (n-hexane:ethyl acetate=6:1) to give 334 mg (53%) of 6,8-difluoro-2-(3-fluoro-4-pivaloylaminophenyl)-5-(4-methylpentylamino)-4H-1-benzopyran-4-one.

Provenance & Evidence